Check
the appropriate box to designate the rule pursuant to which this Schedule is filed:

a.

☐ Rule 13d-1(b)

b.

☒ Rule 13d-1(c)

c.

☐ Rule 13d-1(d)

*
The remainder of this cover page shall be filled out for a reporting person’s initial filing on this form with respect
to the subject class of securities, and for any subsequent amendment containing information which would alter the disclosures
provided in a prior cover page.

The
information required in the remainder of this cover page shall not be deemed to be “filed” for the purpose of Section
18 of the Securities Exchange Act of 1934 (“Act”) or otherwise subject to the liabilities of that section of the Act
but shall be subject to all other provisions of the Act (however, see the Notes).

This Amendment No. 2
is being filed jointly by the Reporting Persons and amends the Schedule 13G initially filed by the Reporting Persons with
the Securities and Exchange Commission (the “SEC”) on September 28, 2017, as amended by Amendment No. 1 thereto
filed by the Reporting Persons with the SEC on October 10, 2017 (the “Schedule 13G”).

Except as set forth
below, all Items of the Schedule 13G remain unchanged. All capitalized terms not otherwise defined herein shall have the meanings
ascribed to such terms in the Schedule 13G.

Item 4.Ownership.

(a) and (b):

As of close of business on December 31, 2017, each of the Reporting Persons may have been deemed to have
beneficial ownership of 1,800,000 shares of Common Stock issuable
upon exercise of a warrant held by Intracoastal (the “Intracoastal Warrant”), and all such shares of
Common Stock represent beneficial ownership of approximately 7.7% of the Common Stock, based on (1) 21,601,475 shares of Common
Stock outstanding as of November 8, 2017 as reported by the Issuer, plus (2) 1,800,000 shares of Common Stock issuable
upon exercise of the Intracoastal Warrant.

(c)

Number
of shares as to which each Reporting Person has:

(1)
Sole power to vote or to direct the vote: 0 .

(2)
Shared power to vote or to direct the vote: 1,800,000 .

(3)
Sole power to dispose or to direct the disposition of 0 .

(4)
Shared power to dispose or to direct the disposition of 1,800,000 .

Item 10. Certification

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above
were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer
of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that
purpose or effect, other than activities solely in connection with a nomination under §240.14a-11.

Page 5 of 6

SIGNATURE

After
reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true,
complete and correct.